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The voltage will drop slightly during the charge pump refresh, as the Mosfet turns off and the body diode starts to conduct. That should not be a problem for your equipment. Now, if you want a droop-free output, you may try the Linear LTC4358. It employs the same charge pump principle like the TI unit, but it has an external connection to add a ho
minimum voltage of li battery is 3.3v I need to replace 2 AA size battery so I need 3v output. Put a silicon diode in series with the battery. It will drop 0.7 volts. How much current does the load draw? The diode you select depends on this.
PWM's are driven through mosfet driver. What kind of MOSFET driver? Bootstrap drivers like IR2110 don't work for this circuit without special provisions. As from figure, if G1>G2, PWM1 is on with 12.5% duty cycle Means the inductor current is commutating through MOSFET body diode with respective losses? But I gues
Hi, there is no need for buck-boost. Either use buck or use boost, depending on your power supply voltage. *** But itīs not that simple as your picture. You need an inductance...and a diode at the power path. and some controlling system... Klaus
Hi, Ive got 2 batteries 11v and 7v, one goes to motor and the other feeds the logic on a motor shield and an Arduino. Both batteries go through a DPDT switch, so there is no permanent connection to the batteries (the switch cuts the +ve) to allow regeneration charge to flow back to the battery. I've been told to put a power diode in series with the
I thought about complete parameters... e.g. M, f, RL, IGBT and diode specification.
The load will start to draw current from the battery if the PMOSFET voltage drop exceeds the substrate diode forward voltage, e.g. 0.7 V.
Hi, I need an assistance to chose the right diode values for protecting the circuite from reverse voltage and current protection. vin 12v, max forward current /consumption of the circuit can reach 7A. do i need to choose a 7A max forward current? can anyone specify example models? is it better to use a schottky (...)
A zener diode won't do it. You need a comparator IC and a voltage reference (maybe a zener diode). You could do it with an LM10 (8-pins IC) and a few resistors since the LM10 has an opamp that can be used as a comparator and it also has an adjustable voltage reference.
Cars use 3 phase alt. so ripple is low compared to peak Whereas single phase , the current is only limited by the diode resistance and can be 100x the average at 1% duty cycle due to the million Farads in a car battery unless regulated somehow. Thus Single phase it far more stressful on rectifier circuits and reactive loads. Heat is deadly to ba
as we know that whenever any device is connected across the battery , electrons from the -ve electrode flows towards the +ve electrode through the external ckt thereby passing current through the device connected. Now if suppose we connect a pn junction diode across the battery by forward biasing it , then electrons from n (...)
You could put a Silicon power diode across the #1 switch to supply current if the coin cell drops below 3.6 and charger happens to be on.
This injects 187.5mV of hysteresis above the 3.00V shutdown to enable it. You probably want 300mV of hysteresis above a shutdown of 11.5V with a drop of <100mV on the switch or < 100mOhms RdsOn. for precision any bandgap reference will do. Even 2V LED @1mA will do or a 1 cent silicon diode with 1mA at 600mV for a reference may do with (...)
Hello, We have had some of our 3Kw offline battery chargers failing so we opened them up and looked inside. battery voltage is 250-400VDC We notice a half bridge LLC converter running after an interleaved PFC stage. The LLC secondary diodes are ISL9R1560P2. these have 29ns reverse recovery time but a higher (...)
The problem with active FET input is ESD prone to failure and low capacitance diode caps add noise. This why RF transformers were used on front ends for wide band reception over 2 decades. Loop antenna shunts ESD risks but picks up stray leakage currents in band from triacs or FL ballasts or other H field noise. That being said I used FET (...)
How about using ORing diodes? Frank
Hi, I am trying to use a TP4056 based CC-CV Li battery charger (along with battery) to make a lamp that automatically switches between AC and battery. I choose the TP4056 CC/CV charger because its small, gives upto 850mA of current and seems to be fairly reliable one. The LEDs that I will use will be 0.5W ones which don't need heatsink. I (...)
Hi, I am planning to use Single Li-ion for my board with MCU and other ICs. Li-ion voltage range is from 3.0V to 4.2V. Since some of my ICs' supply voltage should not exceed 3.6V, i am planning two regulate the voltage to at least 3.0V. My questions are: 1. What is the minimum input voltage if I will be using 3.0V zener diode? 2. Any sugge
Circuit is polarity protection of load connected on +12 point. Zener diode, resistors and transistor limits Vgs. Circuit can be a part of battery supply.
for bi-directional current flow. You use them generally as a load switch and it allows very low conduction losses in either direction when on. Then when you turn it off, it blocks in both directions, as you have the inherent drain-source body diode back to back. Otherwise called a bat fet for battery fet, as you find them as (...)